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Merge pull request #6248 from ethereum/shiftopt-fix-overflow

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Fixes u256 overflow in logical shift optimization rule and adds tests.
This commit is contained in:
chriseth
2019-03-13 12:02:33 +01:00
committed by GitHub
parent 9ccd5dfec3 515fa872c8
commit 58a3f3cf68
7 changed files with 80 additions and 5 deletions
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test/libsolidity/SolidityEndToEndTest.cpp
+12
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@@ -15009,11 +15009,21 @@ BOOST_AUTO_TEST_CASE(bitwise_shifting_constantinople_combined)
c := shl(0xd0, shl(0x40, a))
}
}
function shl_combined_overflow(uint a) public returns (uint c) {
assembly {
c := shl(0x01, shl(not(0x00), a))
}
}
function shr_combined_large(uint a) public returns (uint c) {
assembly {
c := shr(0xd0, shr(0x40, a))
}
}
function shr_combined_overflow(uint a) public returns (uint c) {
assembly {
c := shr(0x01, shr(not(0x00), a))
}
}
function sar_combined_large(uint a) public returns (uint c) {
assembly {
c := sar(0xd0, sar(0x40, a))
@@ -15052,8 +15062,10 @@ BOOST_AUTO_TEST_CASE(bitwise_shifting_constantinople_combined)
BOOST_CHECK(callContractFunction("shl_combined_large(uint256)", u256(0)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shl_combined_large(uint256)", u256("0xffff")) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shl_combined_large(uint256)", u256("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shl_combined_overflow(uint256)", u256(2)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shr_combined_large(uint256)", u256(0)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shr_combined_large(uint256)", u256("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("shr_combined_overflow(uint256)", u256(2)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("sar_combined_large(uint256)", u256(0)) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("sar_combined_large(uint256)", u256("0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) == encodeArgs(u256(0)));
BOOST_CHECK(callContractFunction("sar_combined_large(uint256)", u256("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) == encodeArgs(u256("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")));